Below you can see the front-view size comparison of the Fujifilm X-T100 and Fujifilm XF10. The Fujifilm XF10 is clearly the smaller of the two cameras. Its body is 8 mm narrower, 19 mm shorter and 6 mm thinner than the Fujifilm X-T100.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.